Manufacture of telegraph and telephone cables



27, 1930. w, s, syn- ET AL 1,760,012

MANUFACTURE OF TELEGRAPH AND TELEPHONE CABLES Filed Jan. 2.; 1925 Xiinxw 24,2;

IINVEN'IORS: w. 5. SMITH A. 0. SHUTER By the 11'' W s Patented: May 27, 1930 UNITED STATES- SHUTER, OF HARRow-oN-Trrn-HIL mea 1 MANUFACTURE or TELEGRAPH metastases clintns Application filed January 2, 1825, Serial No. aim in reat fii' i'tain my 6', 153 2 1.

This invention relates to the manufacture of telegraph and telephone cables of the type in which a conductor is surrounded by aspiral of wire or strip of magnetic material. In order to obtain the highest possible. permeability in the magnetic material it has been found advantageous to anneal it after it has been wound on the conductor.

In order that this annealing may be fully effective, it is necessary that'the winding be Very loose, as otherwise the shrinkage of the material due to annealing sets up strains which are detrimental to its permeability.

According to this invention we subject the :1 conductor and the loading material, which has been laid around it in the usual way,

that is, with a reasonable tension, to a special treatment by which the loading wire or'strip is loosened before the annealing process, so

w that the shrinkage of the wire or strip due Preferably this may be effected by mounting the reel of one conductor in a cradle rigidly attached to the rotating part of an ordinary stranding machine and .leading the loaded conductor through a lay'plate of the v is.

machine and around the draw ofi' wheel to a take up reel frictionally driven in thewell known way.

The accompanying drawingillustrates apparatus suitable for use in carrying out the invention. Figure 1 is an elevation and Figure 2 a plan of an apparatus in which the:

loading wire or strip is partially unwound and loosened.

Figure 3 is a side elevation of a-portion of a loaded cable after loading and before the a loading strip has been unwound.

Figure lisa similar view showing a section of the cable after the loading strip has been unwound.

worm wheel' K meshing with a Teena a at which the l aded seawater B hzts been wound is mounted iii a cradle C fixed to a table D, the axis of wliose spindledaeaien er reaaea ee ne ass 19*- ieseea that-theloading wireor a-p is unwanted by a desirednuniber o'f'turn's a given l ength;

The loaded conductor B passes frointhereel A arrange a lay-piste F wand e a iuey e.

androun'd a drawofi wheelH to' take up" reel J. The draw off. the-61 n is dr'itnby a I worm L on a shaft M driven by a"b'elt N round a pulley O on the shaft. Also on the shaft M is a pinion P meshing with another pinion Q, on a counter shaft R and on the counter shaft R is a bevel pinion S meshing with another bevel pinion'T on the spindle E. The reel J is driven by a belt V from the axis of the wheel H. l/Vhen the shaft M is driven the spindle E is turned and the table D carrying the reel A is rotated round the spindle E while at the same time the drawoif wheel H is turned by means of the worm wheel K and worm L.

which passes Figures 3 and 4 show the loaded cable before the loading strip has been untwisted and after it has been passed throughthe machine for the purpose of unwinding the loading strip. The showing in Figure 4 is, of course, exaggerated as it is not the practice to unwind to such an extent.

The term fstrip as used generically in the accompanying claims. It particularly includes wire as hereinbefore referred to and. avoids the use of an alternativeexpression in the claims.

- What'we claim is Y graph and telephone conductors which comprises firstlaying the loading material in strip form around the conductor then partially unwinding said loading material and finally annealing the loaded conductor.

'2. Aprocess for the manufacture of telegraph and telephone conductors which comprises first laying the loading material in strip form around the conductor, then par I tially unwinding theloading material by 1. A process for the manufacture of teleice twisting the conductor and finally annealing? V the loaded conductor.

3. The method of rendering strain sensi tive loading material sufficiently loose after it has been applied helically to a conductor,

so that it may be heat treated without straining it'to anundesirable extent, which comprises twisting the loaded conductor in such a tive loading material, of the type requiring direction as to eflfect the desired loosening.

4. The manufacture of telegraph and tele; 7 7

phone conductors comprising first laying the loading material around the conductor, then partially unwinding the loading material,

and subsequently heat treating the loaded conductor. I I

5. The method of applying strain sensiheat treatment after application to the conductor, to a conductor with'a desired and uniform looseness which comprises windingv a strip of the material about the conductor laim the I foregoing 

